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Power amps tout high linearity, low power

Posted: 05 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power amplifiers? WiMAX? TD-SCDMA? femtocell base station?

Avago Technologies has introduced 1W and 2W families of high-performance power amplifiers designed for next-generation cellular and WiMAX infrastructure applications. These amplifiers offer industry-low current consumption with no RF matching requirements.

The ALM-31122/-31222/-31322 family of 1W base station power amplifiers is available in an ultra-compact size and with no RF matching requirements. This series is said to outperform its competitors by offering very high linearity and exceptional power added efficiency (PAE) at 400mA typical current consumption levels. The new power amplifiers support cellular (GSM, CDMA, W-CDMA, CDMA2000 and TD-SCDMA) and WiMAX frequencies.

Designed to support applications from 750MHz to 3.9GHz, the ALM-31x22 power amplifiers offer built-in active bias circuitry and no RF matching components, which simplify product design and shorten time to market, Avago said. Housed in a miniature 5mm x 6mm x 1.1mm, 22-pin molded chip-on-board package, the ALM-31x22 is suitable for compact picocell or femtocell base station applications.

At typical biasing conditions of 5V and 400mA, the ALM-31122 delivers 31.6dBm of output power (P1dB), 47.6Bm of third order intercept point (OIP3) and 15.6dB gain at 900MHz. The ALM-31222 delivers 31.5dBm P1dB, 47.9dBm OIP3 and 14.9dB gain at 2GHz; and the ALM-31322 delivers 31dBm P1dB, 47.7dBm OIP3 and 13.2dB gain at 3.5GHz.

Avago also introduced high-linearity 2W power amplifiers, beginning with the ALM-32220. Similar to the one-watt power amplifiers, the 2W devices also provide built-in active bias and require no RF matching components. Built to optimally support 1.7-2.7GHz applications, the 800mA current consumption for the ALM-32220 gives it a best-in-class ranking among similar two-watt devices on the market, Avago said.

The ALM-32220 power amplifier delivers 34.4dBm of output power (P1dB), 50dBm of OIP3 and 14.8dB gain at 2GHz. The power amp is housed in a miniature 7mm x 10mm x 1.1mm, 20-pin molded-chip-on-board package. Two additional 2W amplifiers will be introduced in June; they are the ALM-32120, which supports 750MHz to 1GHz, and the ALM-32320, which is optimized for 3.3GHz to 3.9GHz frequencies.

In 1,000-9,999 quantities, pricing for the 1W ALM-31x22 begins at $3.75, and the 2W ALM-32220 begins at $7.19.

- Gina Roos

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